std::move_iterator<Iter>::base

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< cpp‎ | iterator‎ | move iterator
C++
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
(C++20)
(C++20)
(C++20)
Utilities
(C++20)
Iterator adaptors
Range access
(C++11)(C++14)
(C++14)(C++14)
(C++11)(C++14)
(C++14)(C++14)
(C++17)(C++20)
(C++17)
(C++17)
std::move_iterator
(1)
iterator_type base() const;
 (constexpr since C++17)
(until C++20)
constexpr const iterator_type& base( ) const & noexcept ;
(since C++20)
constexpr iterator_type base() &&;
 (2) (since C++20)

Returns the underlying iterator.

1) Returns a copy of(until C++20) reference to(since C++20)
2) Returns an iterator move constructed from the underlying iterator.

Return value

1) current
2) std::move( current )

Example

Run this code
#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
 
int main()
{
    std::vector<int> v{0, 1, 2, 3, 4};
    std::move_iterator<std::vector<int>::reverse_iterator>
        m1{v.rbegin()},
        m2{v.rend()};
 
    std::copy(m1.base(), m2.base(), std::ostream_iterator<int>(std::cout, " "));
    std::cout << '\n';
}

Output: 

4 3 2 1 0

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 3391 C++20 overload (1) returned a copy of the underlying iterator returns a reference
LWG 3593 C++20 overload (1) was not noexcept made noexcept

See also

(C++11)(C++11)(deprecated in C++20)
 accesses the pointed-to element
(public member function)
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